Specifications subject to change without notice. DCD is a trademark and Boston, Boston Acoustics, and MagnaGuard
are registered trademarks of Boston Acoustics © 1999 Boston Acoustics, Inc.
300 Jubilee Drive Peabody, MA 01960 978-538-5000 Fax: 978-538-5199
Specifications
VR-M60
VR-M50
FREQUENCY RESPONSE
(
±
3dB)
51-20,000Hz
59-20,000Hz
RECOMMENDED AMPLIFIER POWER
15-200 watts
15-150 watts
NOMINAL IMPEDANCE
8 ohms
8 ohms
SENSITIVITY
(1 watt [2.83v] at 1m)
90dB
89dB
BASS UNIT
6
1
/
2
" (165mm) DCD™ (Deep Channel Design)
5
1
/
4
" (135mm) copolymer
TWEETER
1" (25mm) black anodized aluminum dome
1" (25mm) black anodized aluminum dome
CROSSOVER FREQUENCY
2500Hz
2700Hz
DIMENSIONS
(H x W x D)
11
3
/
4
x 8
5
/
16
x 11
7
/
8
" (299 x 212 x 303mm)
9
7
/
8
x 7
1
/
8
x 9" (251 x 181 x 230mm)
WEIGHT
17 lbs (8kg)
12 lbs (5.5kg)
FINISH
Cherry or black ash wood veneer
Cherry or black ash wood veneer
with gloss gray top panel
with gloss gray top panel
Lynnfield VR Tweeter with
Amplitude Modification Device
Our sophisticated VR tweeter may be the smoothest, most accurate
high-frequency driver available today. We use a 1-inch (25mm) dome
made from anodized pure aluminum. We chose anodized pure
aluminum for the diaphragm for several reasons: Compared
to a soft dome, aluminum is equally light and more rigid;
the added stiffness improves off-axis dispersion and
consequently the total radiated power above 12kHz.
Compared to other hard dome materials such as titanium,
phenolic, and polycarbonate, our pure aluminum dome has
a resonance beyond the audible range (25kHz) and is far
better damped. This tweeter is unrivaled in its ability
to accurately track the input signal.
To further optimize the tweeter’s response, we
use our patented Amplitude Modification Device
(AMD). The AMD is an innovative acoustic tuning
device, positioned in front of the aluminum dome.
It consists of five miniature ducts of slightly varying
lengths precisely tuned to create an extremely smooth
response. Their tuning is so critical, manufacturing is done to watchmak-
ers standards—the tweeter's AMD is accurate to
±
.001 inch (.025mm)!
Ferrofluid-cooled voice coil
Acoustic damping
High-energy neodymium magnet
Die-cast aluminum heatsink
Faceplate with integral AMD
Surround
1-inch (25mm) anodized aluminum dome
Voice coil carrier
Terminal
Low carbon steel top plate
Yoke
Tweeter response
without AMD
Boston's AMD
creates smooth,
natural response
The port is precisely flared
at both ends to minimize
audible turbulence.
Dual gold-plated binding
posts allow bi-amp/bi-wire
connections for optimum
performance.
1kHz
10kHz 20kHz 40kHz
0 dB
+5 dB
-5 dB
1kHz
10kHz 20kHz 40kHz
0 dB
+5 dB
-5 dB
